Synthesis, characterization and thermokinetic analysis of the novel sugar based styrene co-polymer

Telli, Fatma Cetin

doi:10.1590/0104-1428.02620

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ORIGINAL ARTICLE • Polímeros 30 (2) • 2020 • https://doi.org/10.1590/0104-1428.02620 copy

Synthesis, characterization and thermokinetic analysis of the novel sugar based styrene co-polymer

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

A new α-chloralose (1,2-O-(R)-trichloroethylidene-α-D-glucofuranose)-based copolymer of styrene (PSVTEG) (2) was synthesized from vinyl (hydroxyl) furan monomer (1) and styrene by a conventional free radical polymerization reaction. The thermal decomposition kinetics of polymer were investigated by means of thermogravimetric analysis in dynamic nitrogen atmosphere at different heating rates. The apparent activation energy for the main stage thermal decomposition of the copolymer PSVTEG (2) was calculated using the Flynn-Wall-Ozawa and found to be 159.0±3 kj/mol. In addition, the activation energy value was calculated according to Coats-Redfern method and found to be compatible with the obtained result. The thermogram of the glycopolymer (PSVTEG) (2) has two decomposition stages and the calculated activation energy indicated that the main degradation stage is a nonspontaneous process (integral form 1/(1−α)² for F₃).

Keywords:
glycopolymers; carbohydrate based vinyl copolymer; α-chloralose; thermal analysis; decomposition kinetic

Symbol	Reaction model	f(α)	g(α)
Sigmoidal curves
A2	Avrami–Erofěev (n = 2) (Nucleation and growth)	2(1−α)[−ln(1−α)]^1/2	[−ln(1−α)]^1/2
A3	Avrami–Erofěev (n = 3) (Nucleation and growth)	3(1−α)[−ln(1−α)]^2/3	[−ln(1−α)]^1/3
A4	Avrami–Erofěev (n = 4) (Nucleation and growth)	4(1−α)[−ln(1−α)]^3/4	[−ln(1−α)]^1/4
An	Avrami–Erofěev (n = n) (Nucleation and growth)	n(1−α)[−ln(1−α)]^(n-1)/n	[−ln(1−α)]^1/n
Deceleration curves
R1	Zero-order (Polany–Winger equation) Phase-boundary controlled reaction (one dimensional movement)	1	α
R2	Phase-boundary controlled reaction (contracting area, i.e., bidimensional shape)	2(1−α)^1/2	[1−(1−α)^1/2]
R3	Phase-boundary controlled reaction (contracting area, i.e., bidimensional shape)	3(1−α)^2/3	[1−(1−α)^1/3]
F1	First-order (Mampel) (Random nucleation with two nucleus on the individual particle)	(1−α)	−ln(1−α)
F2	Second-order (Random nucleation with two nucleus on the individual particle)	(1−α)²	1/(1−α)
F3	Third-order (Random nucleation with two nucleus on the individual particle)	(1−α)³	1/(1−α)²
D1	One-dimensional diffusion	1/2α	α²
D2	Two-dimensional diffusion (bidimensional particle shape) Valensi equation	1/[−ln(1−α)]	(1−α)ln(1−α) + α
D3	Three-dimensional diffusion (tridimensional particle shape) Jander equation	3(1−α)^1/3/2[(1−α)^−1/3 −1]	[1−(1−α)^1/3]²
D4	Three-dimensional diffusion (tridimensional particle shape) Ginstling–Brounshtein	3/2[(1−α)^−1/3 −1]	(1−2α/3)−(1−α)^2/3

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[1] * fatma.cetin@ege.edu.tr